ui: Restructure repo to use tools/ui folder and ui / UI / llama-ui / LLAMA_UI naming (#23064)

* webui: Move static build output from `tools/server/public` to `build/ui` directory

* refactor: Move to `tools/ui`

* refactor: rename CMake variables and preprocessor defines

- Rename LLAMA_BUILD_WEBUI -> LLAMA_BUILD_UI (old kept as deprecated)
- Rename LLAMA_USE_PREBUILT_WEBUI -> LLAMA_USE_PREBUILT_UI (old kept as deprecated)
- Backward compat: old vars auto-forward to new ones with DEPRECATION warning
- Rename internal vars: WEBUI_SOURCE -> UI_SOURCE, WEBUI_SOURCE_DIR -> UI_SOURCE_DIR, etc.
- Rename HF bucket: LLAMA_WEBUI_HF_BUCKET -> LLAMA_UI_HF_BUCKET
- Emit both LLAMA_BUILD_WEBUI and LLAMA_BUILD_UI preprocessor defines
- Emit both LLAMA_WEBUI_DEFAULT_ENABLED and LLAMA_UI_DEFAULT_ENABLED

* refactor: rename CLI flags (--webui -> --ui) with backward compat

- Add --ui/--no-ui (old --webui/--no-webui kept as deprecated aliases)
- Add --ui-config (old --webui-config kept as deprecated alias)
- Add --ui-config-file (old --webui-config-file kept as deprecated alias)
- Add --ui-mcp-proxy/--no-ui-mcp-proxy (old --webui-mcp-proxy kept as deprecated)
- Add new env vars: LLAMA_ARG_UI, LLAMA_ARG_UI_CONFIG, LLAMA_ARG_UI_CONFIG_FILE, LLAMA_ARG_UI_MCP_PROXY
- C++ struct fields: params.ui, params.ui_config_json, params.ui_mcp_proxy added alongside old fields
- Backward compat: old fields synced to new ones in g_params_to_internals

* refactor: update C++ server internals with backward compat

- Rename json_webui_settings -> json_ui_settings (both kept in server_context_meta)
- Rename params.webui usage -> params.ui (both synced, old still works)
- JSON API emits both "ui"/"ui_settings" and "webui"/"webui_settings" keys
- Server routes use params.ui_mcp_proxy || params.webui_mcp_proxy
- Preprocessor guards use #if defined(LLAMA_BUILD_UI) || defined(LLAMA_BUILD_WEBUI)

* refactor: rename CI/CD workflows, artifacts, and build script

- Rename webui-build.yml -> ui-build.yml; artifact webui-build -> ui-build
- Rename webui-publish.yml -> ui-publish.yml; var HF_BUCKET_WEBUI_STATIC_OUTPUT -> HF_BUCKET_UI_STATIC_OUTPUT
- Rename server-webui.yml -> server-ui.yml; job webui-build/checks -> ui-build/checks
- Update server.yml: job/artifact refs webui-build -> ui-build
- Update release.yml: all webui-build/publish refs -> ui-build/publish; HF_TOKEN_WEBUI_STATIC_OUTPUT -> HF_TOKEN_UI_STATIC_OUTPUT
- Update server-self-hosted.yml: webui-build -> ui-build
- Update build-self-hosted.yml: HF_WEBUI_VERSION -> HF_UI_VERSION
- Rename webui-download.cmake -> ui-download.cmake (internal refs updated)
- Update labeler.yml: server/webui -> server/ui path label

* docs: update CODEOWNERS and server README docs

- Update CODEOWNERS: team ggml-org/llama-webui -> ggml-org/llama-ui, path /tools/server/webui/ -> /tools/ui/
- Update server README.md: CLI tables show --ui flags with deprecated --webui aliases
- Update server README-dev.md: "WebUI" -> "UI", paths updated to tools/ui/

* fix: Small fixes for UI build

* fix: CMake.txt syntax

* chore: Formatting

* fix: `.editorconfig` for llama-ui

* chore: Formatting

* refactor: Use `APP_NAME` in Error route

* refactor: Cleanup

* refactor: Single migration service

* make llama-ui a linkable target

* fix: UI Build output

* fix: Missing change

* fix: separate llama-ui npm build output into build/tools/ui/dist subfolder + use cmake npm build instead of downloading ui-build.yml artifacts in CI

* refactor: UI workflows cleanup

---------

Co-authored-by: Xuan Son Nguyen <son@huggingface.co>

tools/ui/src/lib/utils/svg-to-png.ts

@@ -0,0 +1,71 @@
+import { MimeTypeImage } from '$lib/enums';
+
+/**
+ * Convert an SVG base64 data URL to a PNG data URL
+ * @param base64UrlSvg - The SVG base64 data URL to convert
+ * @param backgroundColor - Background color for the PNG (default: 'white')
+ * @returns Promise resolving to PNG data URL
+ */
+export function svgBase64UrlToPngDataURL(
+	base64UrlSvg: string,
+	backgroundColor: string = 'white'
+): Promise<string> {
+	return new Promise((resolve, reject) => {
+		try {
+			const img = new Image();
+
+			img.onload = () => {
+				const canvas = document.createElement('canvas');
+				const ctx = canvas.getContext('2d');
+
+				if (!ctx) {
+					reject(new Error('Failed to get 2D canvas context.'));
+					return;
+				}
+
+				const targetWidth = img.naturalWidth || 300;
+				const targetHeight = img.naturalHeight || 300;
+
+				canvas.width = targetWidth;
+				canvas.height = targetHeight;
+
+				if (backgroundColor) {
+					ctx.fillStyle = backgroundColor;
+					ctx.fillRect(0, 0, canvas.width, canvas.height);
+				}
+				ctx.drawImage(img, 0, 0, targetWidth, targetHeight);
+
+				resolve(canvas.toDataURL(MimeTypeImage.PNG));
+			};
+
+			img.onerror = () => {
+				reject(new Error('Failed to load SVG image. Ensure the SVG data is valid.'));
+			};
+
+			img.src = base64UrlSvg;
+		} catch (error) {
+			const message = error instanceof Error ? error.message : String(error);
+			const errorMessage = `Error converting SVG to PNG: ${message}`;
+			console.error(errorMessage, error);
+			reject(new Error(errorMessage));
+		}
+	});
+}
+
+/**
+ * Check if a file is an SVG based on its MIME type
+ * @param file - The file to check
+ * @returns True if the file is an SVG
+ */
+export function isSvgFile(file: File): boolean {
+	return file.type === MimeTypeImage.SVG;
+}
+
+/**
+ * Check if a MIME type represents an SVG
+ * @param mimeType - The MIME type to check
+ * @returns True if the MIME type is image/svg+xml
+ */
+export function isSvgMimeType(mimeType: string): boolean {
+	return mimeType === MimeTypeImage.SVG;
+}